jaredbeck · April 15, 2019 19:58 · Apr 15, 2019
diff --git a/symbol_to_proc_test.rb b/symbol_to_proc_test.rb
@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require "bundler/inline"
+
+gemfile(true) do
+  source "https://rubygems.org"
+  gem "cancancan", "3.0.0"
+  gem "rails", "5.2.3"
+  gem "sqlite3"
+end
+
+require 'active_record'
+require 'cancancan'
+require 'cancan/model_adapters/active_record_adapter'
+require 'cancan/model_adapters/active_record_4_adapter'
+require 'minitest/autorun'
+require 'logger'
+
+# This connection will do for database-independent bug reports.
+ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
+ActiveRecord::Base.logger = Logger.new(STDOUT)
+
+ActiveRecord::Schema.define do
+  create_table :tasks, force: true do |t|
+    t.datetime :deleted_on
+  end
+end
+
+class Task < ActiveRecord::Base
+  # wrong number of arguments (given 1, expected 0)
+  def deleted?
+    deleted_on.present?
+  end
+end
+
+class Ability
+  include CanCan::Ability
+
+  def initialize(user)
+    can :edit, Task
+    cannot :edit, Task, &:deleted?
+
+    # Workaround: change the above to this form
+    #
+    # cannot :edit, Task do |t|
+    #   t.deleted?
+    # end
+  end
+end
+
+class BugTest < Minitest::Test
+  def test_association_stuff
+    task = Task.create!
+    ability = Ability.new(nil)
+    assert ability.can?(:edit, task)
+    # Error:
+    # BugTest#test_association_stuff:
+    # ArgumentError: wrong number of arguments (given 1, expected 0)
+    #
+    # Exception `ArgumentError' at
+    # .../cancancan-3.0.0/lib/cancan/conditions_matcher.rb:24 -
+    # wrong number of arguments (given 1, expected 0)
+  end
+end
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